Re: [PATCH] mm: add sys_madvise2 and MADV_NAME to name vmas

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On Wed, Jul 24, 2013 at 2:40 AM, Jan Glauber <jan.glauber@xxxxxxxxx> wrote:
> On Fri, Jul 05, 2013 at 12:40:50PM -0700, Colin Cross wrote:
>> On Thu, Jul 4, 2013 at 1:22 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
>> > On 07/03, Colin Cross wrote:
>> >>
>> >> The names of named anonymous vmas are shown in /proc/pid/maps
>> >> as [anon:<name>].  The name of all named vmas are shown in
>> >> /proc/pid/smaps in a new "Name" field that is only present
>> >> for named vmas.
>> >
>> > And this is the only purpose, yes?
>>
>
> The heuristics used for the thread stack annotation is not working always:
>
> https://lkml.org/lkml/2013/6/26/256
>
> Maybe we can get rid of the heuristic if there is an explicit interface to
> mark vma's?
>
> OTOH, a new flag bit instead of a string would be enough to mark the thread
> stacks correctly.

I noticed this possibility when looking at the stack naming code, but
I didn't have any evidence that it actually happens.  As my patch is
written (as well as the new version, see
http://permalink.gmane.org/gmane.linux.kernel.mm/103228) it will
ignore any vma that found a name any other way, but it could be
changed to override the automatic stack naming.

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